Egg whites freeze brilliantly, keep forever, and are as good thawed as they were fresh. We keep one container in our freezer and add new whites to the top. If we remember to mark how many whites we’ve added, it’s easy to tell when we have enough for a favorite recipe.

We’ve also heard of people freezing one or two egg whites in ice cube trays, which comes in handy when only a few are needed in a recipe.